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Utils: Add "findOr(..., nullopt, ...)" function

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findOr(nullopt) returns either a value or a std::nullopt for the first entry
in a container where the predicate returned true.

This makes it easy to write constructs like:

if (auto found = Utils::findOr(container, std::nullopt, [](auto){ ... condition ...}) {
...
}

Change-Id: I6f8f0f9c0d8486c32395123d8c2dcba427887189
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
This commit is contained in:
Marcus Tillmanns
2023-11-29 11:00:54 +01:00
parent 4153520fb6
commit 0e59c9e4e1
2 changed files with 22 additions and 0 deletions
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19
src/libs/utils/algorithm.h
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@@ -82,6 +82,10 @@ template<typename T, typename R, typename S>
Q_REQUIRED_RESULT typename T::value_type findOr(const T &container,
typename T::value_type other,
R S::*member);
template<typename T, typename F>
Q_REQUIRED_RESULT std::optional<typename T::value_type> findOr(const T &container,
std::nullopt_t,
F function);
/////////////////////////
// findOrDefault
@@ -473,6 +477,21 @@ typename T::value_type findOr(const T &container, typename T::value_type other,
return findOr(container, other, std::mem_fn(member));
}
template<typename C, typename F>
Q_REQUIRED_RESULT typename std::optional<typename C::value_type> findOr(const C &container,
std::nullopt_t,
F function)
{
typename C::const_iterator begin = std::begin(container);
typename C::const_iterator end = std::end(container);
typename C::const_iterator it = std::find_if(begin, end, function);
if (it == end)
return std::nullopt;
return *it;
}
//////////////////
// findOrDefault
//////////////////